Make aura_demo work on Mac

base/message_loop/message_loop.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 368 matching lines @@
       new internal::MessageLoopProxyImpl(incoming_task_queue_);
   thread_task_runner_handle_.reset(
       new ThreadTaskRunnerHandle(message_loop_proxy_));
 }
 
 void MessageLoop::RunHandler() {
   DCHECK_EQ(this, current());
 
   StartHistogrammer();
 
-#if !defined(OS_MACOSX) && !defined(OS_ANDROID) && \
-    !defined(USE_GTK_MESSAGE_PUMP)
+#if defined(USE_AURA)
   if (run_loop_->dispatcher_ && type() == TYPE_UI) {
     static_cast<MessagePumpForUI*>(pump_.get())->
         RunWithDispatcher(this, run_loop_->dispatcher_);
     return;
   }
 #endif
 
   pump_->Run(this);
 }
 
@@ skipping 318 matching lines @@
       fd,
       persistent,
       mode,
       controller,
       delegate);
 }
 
 #endif
 
 }  // namespace base